name: 'check-changes'
description: 'Checks for file changes in a specified path.'

inputs:
  base-commit:
    description: 'The commit hash to compare against. If not provided, the action will use HEAD^.'
    default: 'HEAD^'
  paths:
    description: 'A comma-separated list of file paths to check for changes. If any of these paths has changed files, the action will return true.'
    default: ''

outputs:
  has-changes:
    description: 'Indicates whether there are changes in the specified paths.'
    value: ${{ steps.check.outputs.has-changes }}


runs:
  using: 'composite'
  steps:
    - name: Check changes
      id: check
      shell: bash
      run: |
        hasChanges=false
        baseCommit='${{ inputs.base-commit }}'

        if [ "$baseCommit" = "0000000000000000000000000000000000000000" ]; then
          echo "Base commit is zero hash (merge commit or new branch). Define as always has changes."
          hasChanges=true
        fi

        if [ $hasChanges = false ]; then
          IFS=',' read -r -a paths <<< "${{ inputs.paths }}"
          diff=$(git diff --name-only $baseCommit HEAD)

          while IFS= read -r line; do
            for path in "${paths[@]}"; do
              if [[ $line == $path* ]]; then
                hasChanges=true
                break 2
              fi
            done
          done <<< "$diff"
        fi

        echo "OUT: has-changes=$hasChanges"
        echo "has-changes=$hasChanges" >> $GITHUB_OUTPUT